Paperless cleaning device for steel mesh of full-automatic solder paste printing machine

Abstract

The invention discloses a full-automatic solder paste printer steel mesh paperless cleaning device which comprises a rack, a cleaning assembly, a roller assembly and a brush assembly, the cleaning assembly comprises a first sliding plate, a lifting plate and scrapers, the lifting plate is connected with the first sliding plate in an up-down sliding mode, and the scrapers are arranged at the upper end of the lifting plate in parallel at intervals; the roller assembly comprises a side plate, a second sliding plate and a roller brush, the side plate is arranged at the upper end of the front end wall of the rack, the second sliding plate is connected with the side plate in a left-right sliding mode, the roller brush is rotatably arranged at the lower end of the second sliding plate, and the roller brush is rotatably connected with the second sliding plate in a front-back rotating mode. The material box is arranged on one side of the upper end wall of the front end of the rack, and the brush is vertically arranged in the material box. According to the technical scheme, paperless cleaning of the steel mesh can be achieved, cleaning paper does not need to be replaced after shutdown, the production efficiency is improved, the cleaning paper can be saved, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of solder paste printing machine technology, and in particular to a paperless stencil cleaning device for a fully automatic solder paste printing machine. Background Technology

[0002] Solder paste printers are key equipment in the electronics manufacturing industry. They are mainly used to accurately print solder paste or red glue on printed circuit boards (PCBs) to provide a foundation for subsequent electronic component mounting. They achieve efficient production through precision mechanical systems and advanced control technologies.

[0003] Surface Mount Technology (SMT), as a core assembly process in the electronics manufacturing industry, is widely used in the production of various electronic products such as consumer electronics, automotive electronics, and communication equipment due to its advantages of high density, miniaturization, and high automation. In the SMT process, solder paste printing is a key step connecting component placement and reflow soldering. Its printing quality directly determines the reliability of solder joints and the stability of circuit connections, thus affecting the yield and lifespan of the final product.

[0004] As the core tooling of fully automated solder paste printers, the stencil is precisely etched or laser-cut to create openings that correspond one-to-one with the PCB pads, enabling the quantitative and precise transfer of solder paste. The precision of the stencil openings and the cleanliness of its surface directly affect the solder paste release effect: clean stencil openings ensure that the solder paste completely fills and is evenly transferred to the PCB pads, forming a neat solder paste pattern; while contaminants on the stencil openings or surface will directly lead to printing defects such as insufficient solder, cold solder joints, and bridging, and in severe cases, cause batch production to be scrapped. Therefore, maintaining the cleanliness of the stencil is a core prerequisite for ensuring the continuity and stability of SMT production.

[0005] In continuous printing, stencil contamination is inevitable, and its types and causes mainly fall into the following three categories:

[0006] Solder paste residue contamination: Solder paste is composed of solder powder, flux, thixotropic agents, and other components. During printing, some solder paste cannot be completely demolded from the openings and remains on the wall of the opening or the upper and lower surfaces of the stencil. With the increase of printing cycles, the residual solder paste will gradually accumulate and dry (especially in high-temperature production environments), causing the cross-sectional area of ​​the openings to shrink or even become blocked, directly resulting in insufficient solder paste transfer and causing defects such as insufficient solder and open solder joints.

[0007] Environmental and process pollutants: The air in the SMT production workshop may contain impurities such as dust and fibers, which are easily adsorbed on the surface of the stencil or embedded in the openings during the printing process; at the same time, oxide layer debris on the PCB board surface and flux residue on component leads may also be transferred to the stencil through contact, further aggravating pollution.

[0008] Flux residue adhesion: During the printing process, some of the flux in the solder paste will overflow, adhere to the stencil surface, and gradually solidify, forming a sticky contaminant. This not only affects the solder paste release but may also attract more impurities, creating a vicious cycle.

[0009] If these contaminants are not removed in time, they will lead to a significant increase in printing defect rates, while also increasing rework costs, reducing production efficiency, and even causing permanent damage to the stencil due to long-term contamination, thus increasing tooling procurement costs.

[0010] To ensure the cleanliness of the stencil, it needs to be cleaned regularly. However, current methods for cleaning stencils mainly rely on manual washing or simple solvent cleaning, which have many limitations: Manual cleaning relies on operators using brushes and solvents (such as alcohol and acetone) to manually wipe the surface of the stencil and the openings. The cleaning effect is greatly affected by human factors and it is difficult to completely remove the dried solder paste remaining on the hole walls. At the same time, the cleaning efficiency is low and cannot meet the cycle time requirements of large-scale automated production lines. Furthermore, long-term exposure to solvents can harm the health of operators and pose safety hazards.

[0011] Simple solvent cleaning: The stencil is cleaned by immersion or spraying in a solvent. Although this can improve efficiency to some extent, the choice of solvent is limited and the adaptability to different solder paste compositions is poor. In addition, solvent residue is easily left on the surface of the stencil after cleaning. If it is not completely dried, it will affect the quality of subsequent solder paste printing. Furthermore, solvent waste is serious and environmentally unfriendly, which does not meet the current policy requirements for green production.

[0012] As the electronics manufacturing industry moves towards higher density, precision, and automation, the integration of PCB boards in SMT products is constantly increasing, and the size of solder pads is continuously shrinking (e.g., the solder pad size of 01005 packaged components is only 0.4mm × 0.2mm). This places increasingly stringent requirements on the precision and cleanliness of stencil openings. Traditional manual cleaning methods can no longer meet the stencil cleaning needs corresponding to micro-sized solder pads. There is an urgent need for an efficient, thorough, environmentally friendly, and automated stencil cleaning technology to adapt to the automated rhythm of production lines, ensure precision printing quality, and simultaneously reduce labor costs and environmental risks. Summary of the Invention

[0013] The main objective of this invention is to propose a paperless stencil cleaning device for a fully automatic solder paste printing machine, which aims to solve the problems mentioned in the background art of the existing stencil cleaning methods, such as the need for frequent replacement of cleaning paper, the need for machine downtime affecting production efficiency, and high costs.

[0014] To achieve the above objectives, the present invention proposes a fully automatic paperless stencil cleaning device for solder paste printing machines, comprising a frame, a cleaning assembly, a roller assembly, and a brush assembly. A stencil is provided at the upper end of the frame. The cleaning assembly includes a first sliding plate, a lifting plate, and a scraper. The two ends of the first sliding plate are slidably connected to the two sides of the upper end of the frame, respectively. The front end walls of the two ends of the first sliding plate are detachably fixedly connected to the front end walls of the two sides of the frame, respectively. The lifting plate is slidably connected to the first sliding plate. The scrapers are arranged parallel to each other at intervals at the upper end of the lifting plate, and the upper end walls of the scrapers can all be... The lower end wall of the steel mesh slides against the roller assembly, which includes a side plate, a second sliding plate, and a roller brush. The side plate is disposed at the upper end of the front wall of the frame. The second sliding plate is slidably connected to the side plate from left to right. The roller brush is rotatably disposed at the lower end of the second sliding plate and is rotatably connected to the second sliding plate from front to back. The roller brush can abut against the upper end wall of the scraper. The brush assembly includes a material box and a brush. The material box is disposed on one side of the upper end wall of the front end of the frame. The brush is vertically disposed in the material box and can abut against the roller brush.

[0015] Optionally, the cleaning assembly further includes a lifting cylinder, a vacuum tube, and a scraper mounting base. The lifting cylinder is respectively disposed at both ends of the upper wall of the first sliding plate, and the cylinder rod of the lifting cylinder is fixedly connected to both ends of the lifting plate. The vacuum tube is disposed on the lower wall of the lifting plate, one end of the vacuum tube is closed, and the other end of the vacuum tube is provided with a vacuum pump air pipe interface. The scraper mounting base is disposed on the upper wall of the lifting plate, and the upper wall of the scraper mounting base is provided with multiple slots spaced parallel to each other. The scraper is detachably embedded in the slots. The upper wall of the vacuum tube is provided with multiple first opening slots. The upper wall of the lifting plate is provided with multiple first through slots communicating with the first opening slots in the middle. The upper wall of the scraper mounting base is provided with multiple second through slots communicating with the first through slots.

[0016] Optionally, the cleaning assembly further includes a pressure plate and fastening bolts. The rear end of the pressure plate has two oblong holes arranged side by side. The two ends of the scraper mounting base have threaded holes that correspond one-to-one with the oblong holes. The fastening bolts are respectively inserted into the oblong holes and screwed into the threaded holes. The front end wall of the pressure plate has a first limiting groove. The two ends of the scraper are respectively embedded in the first limiting groove, and the inner top wall of the first limiting groove abuts against the upper end wall of the scraper.

[0017] Optionally, the upper end wall of the lifting plate is provided with a plurality of limiting blocks along the length direction, and the lower end wall of the scraper mounting base is provided with a plurality of second limiting grooves corresponding one-to-one with the limiting blocks, and the limiting blocks are respectively detachably embedded in the second limiting grooves.

[0018] Optionally, the roller assembly further includes a third sliding plate, a first slide rail, a first slider, a spring, and a limiting post. The first slide rail is vertically disposed at both ends of the front end wall of the second sliding plate. The first slider is slidably connected to the first slide rail. Both ends of the third sliding plate are fixedly connected to the first slider. A limiting plate protrudes from the middle front end wall of the second sliding plate. A through hole is provided at both ends of the limiting plate. The limiting post is slidably connected to the through hole. The lower end of the limiting post is fixedly connected to the lower end of the third sliding plate. A limiting flange is provided at the upper end of the limiting post. The limiting flange can abut against the upper end wall of the through hole. The spring is sleeved on the limiting post, and the upper and lower ends of the spring abut against the lower end wall of the through hole and the third sliding plate, respectively. The roller brush is rotatably connected to the lower end of the third sliding plate.

[0019] Optionally, the roller assembly further includes a linear cylinder, a first rotating arm, a second rotating arm, a roller brush mounting bracket, and a roller brush motor. The linear cylinder is disposed on the front end wall of the third sliding plate. The rear end of the first rotating arm is rotatably connected to the sliding block of the linear cylinder. The front end of the first rotating arm is rotatably connected to the rear end of the second rotating arm. The middle of the second rotating arm is rotatably connected to the lower end wall of the middle of the third sliding plate. The upper end of the roller brush mounting bracket is fixedly connected to the front end of the second rotating arm. The roller brush motor is disposed at the lower end of the roller brush mounting bracket. One end of the roller brush is fixedly connected to the output shaft of the roller brush motor.

[0020] Optionally, the roller assembly further includes a first motor, a driving synchronous pulley, a driven synchronous pulley, a synchronous belt, a second slide rail, and a second slider. The second motor is disposed at one end of the side plate, the driving synchronous pulley is disposed on the output shaft of the first motor, the driven synchronous pulley is rotatably disposed at the other end of the side plate, the synchronous belt is meshed with the driving synchronous pulley and the driven synchronous pulley respectively, the second slide rail is disposed on the front end wall of the side plate, the second slider is slidably connected to the second slide rail, the lower end of the second sliding plate is fixedly connected to the second slider, and the upper end of the second sliding plate is fixedly connected to the synchronous belt.

[0021] Optionally, the system further includes a third slide rail, a third slider, a fourth slider, and a crossbeam. The third slide rail is respectively disposed on both sides of the upper end of the frame. The third slider and the fourth slider are slidably connected to the third slide rail. The two ends of the first sliding plate are respectively fixedly connected to the third slider. The two ends of the crossbeam are respectively fixedly connected to the fourth slider. The rear end walls of the two ends of the first sliding plate are respectively detachably fixedly connected to the crossbeam.

[0022] Optionally, it also includes a second motor, a lead screw, and a nut. The second motor is disposed at one end of the upper end of the frame. The two ends of the lead screw are respectively rotatably connected to the upper end of the frame. The output shaft of the second motor is fixedly connected to one end of the lead screw. The nut is disposed at one end of the crossbeam and is threadedly connected to the lead screw.

[0023] Optionally, it also includes a first electromagnet and a second electromagnet, the first electromagnet and the second electromagnet being respectively disposed on the front end wall and the rear end wall at both ends of the first sliding plate, and an iron plate being respectively disposed on the front end wall at both ends of the crossbeam. The first electromagnet is detachably and fixedly connected to the upper end of the frame, and the second electromagnet is detachably and fixedly connected to the iron plate.

[0024] The technical solution of this invention has the following beneficial effects: The technical solution of this invention achieves stencil cleaning by transferring solder paste. First, a lifting cylinder raises the scraper to contact the stencil. Then, a motor drives the scraper to reciprocate, scraping away excess solder paste from the stencil. Simultaneously, vacuum adsorption transfers the solder paste onto the scraper, effectively cleaning the solder paste on the stencil. Next, a rotating roller brush cleans and transfers the solder paste on the scraper. Finally, the roller brush is rotated to contact the stencil, and the stencil brush cleans and transfers the solder paste on it. The scraped-off solder paste waste is collected and recycled through a material box, thus achieving a paperless stencil cleaning process. There is no need to stop the machine to replace the cleaning paper, improving production efficiency and saving cleaning paper, thus reducing production costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention. Figure 2 This is a partial structural schematic diagram of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention. Figure 3 This is a schematic diagram of another part of the structure of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention. Figure 4 This is a schematic diagram of another part of the structure of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention. Figure 5 This is a schematic diagram of another part of the structure of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention. Figure 6 This is a partially exploded structural diagram of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention. Figure 7 This is an exploded structural diagram of another part of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention. Figure 8 This is a schematic diagram of another part of the structure of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention. Figure 9 This is an exploded structural diagram of another part of a paperless stencil cleaning device for a fully automatic solder paste printing machine according to an embodiment of the present invention.

[0027] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0030] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0031] This invention proposes a paperless stencil cleaning device for a fully automatic solder paste printing machine.

[0032] like Figures 1 to 9 As shown, in one embodiment of the present invention, the fully automatic solder paste printing machine stencil paperless cleaning device includes a frame 100, a cleaning assembly 200, a roller assembly 300, and a brush assembly 400. A stencil 500 is provided at the upper end of the frame 100. The cleaning assembly 200 includes a first sliding plate 201, a lifting plate 202, and a scraper 203. The two ends of the first sliding plate 201 are slidably connected to the two sides of the upper end of the frame 100, respectively. The front end walls of the two ends of the first sliding plate 201 are detachably fixedly connected to the front end walls of the two sides of the frame 100, respectively. The lifting plate 202 is slidably connected to the first sliding plate. The scrapers 203 are arranged parallel to each other at the upper end of the lifting plate 202, and the upper end walls of the scrapers 203 can slide against the lower end walls of the stencil 500. The roller assembly 300 includes a side plate 301, a second sliding plate 302, and a roller brush. 303, side plate 301 is disposed at the upper end of the front wall of frame 100, second sliding plate 302 is slidably connected to side plate 301, roller brush 303 is rotatably disposed at the lower end of second sliding plate 302, and roller brush 303 is rotatably connected to second sliding plate 302. Roller brush 303 can abut against the upper end wall of scraper 203. Brush assembly 400 includes material box 401 and brush 402. Material box 401 is disposed on one side of the upper end wall of the front end of frame 100. Brush 402 is vertically disposed in material box 401. The lower end wall of brush 402 is fixedly connected to the inner bottom wall of material box 401. Brush 402 can abut against roller brush 303. Stencil 500 is cleaned by scraper 203. Solder paste scraped off by scraper 203 is transferred to brush 402 by roller brush 303 and collected by material box 401.

[0033] Specifically, the cleaning assembly 200 also includes a lifting cylinder 204, a vacuum tube 205, and a scraper mounting base 206. The lifting cylinder 204 is respectively disposed at both ends of the upper end wall of the first sliding plate 201, and the cylinder rods of the lifting cylinder 204 are respectively fixedly connected to both ends of the lifting plate 202. The vacuum tube 205 is disposed on the lower end wall of the lifting plate 202, one end of the vacuum tube 205 is configured as a closed structure, and the other end of the vacuum tube 205 is provided with a vacuum pump air pipe interface 2051. The scraper mounting base 206... 6 is disposed on the upper end wall of the lifting plate 202. The upper end wall of the scraper mounting base 206 is provided with multiple slots 2061 arranged in parallel and at intervals. The scraper 203 is detachably embedded in the slot 2061. The upper end wall of the vacuum tube 205 is provided with multiple first opening slots 2052. The middle of the upper end wall of the lifting plate 202 is provided with multiple first through slots 2021 communicating with the first opening slots 2052. The upper end wall of the scraper mounting base 206 is provided with multiple second through slots 2062 communicating with the first through slots 2021.

[0034] Specifically, the cleaning assembly 200 also includes a pressure plate 207 and fastening bolts (not shown). The rear end of the pressure plate 207 is provided with two oblong holes 2071 side by side. The two ends of the scraper mounting base 206 are provided with threaded holes 2063 corresponding to the oblong holes. The fastening bolts are respectively inserted into the oblong holes 2071 and screwed into the threaded holes 2063. The front end wall of the pressure plate 207 is provided with a first limiting groove 2072. The two ends of the scraper 203 are respectively embedded in the first limiting groove 2072, and the inner top wall of the first limiting groove 2072 abuts against the upper end wall of the scraper 203.

[0035] Specifically, the upper end wall of the lifting plate 202 is provided with multiple limiting blocks (not shown) along the length direction, and the lower end wall of the scraper mounting base 206 is provided with multiple second limiting grooves (not shown) corresponding to the limiting blocks one by one. The limiting blocks are detachably embedded in the second limiting grooves.

[0036] Specifically, the roller assembly 300 further includes a third sliding plate 304, a first slide rail 305, a first slider 306, a spring 307, and a limiting post 308. The first slide rail 305 is vertically disposed at both ends of the front end wall of the second sliding plate 302. The first slider 306 is slidably connected to the first slide rail 305. Both ends of the third sliding plate 304 are fixedly connected to the first slider 306. A limiting plate 3041 protrudes from the middle front end wall of the second sliding plate 304. A limiting plate 3041 is provided at both ends of the limiting plate 3041. A through hole (not shown) is provided. Limiting posts 308 are slidably connected to the through hole in the upper and lower parts. The lower ends of the limiting posts 308 are fixedly connected to the lower ends of the third sliding plate 304. A limiting flange 3081 is provided at the upper end of the limiting post 308. The limiting flange 3081 can abut against the upper end wall of the through hole. Springs 307 are respectively sleeved on the limiting posts 308, and the upper and lower ends of the springs 307 abut against the lower end wall of the through hole and the third sliding plate 304, respectively. The roller brush 303 is rotatably connected to the lower end of the third sliding plate 304 in the front and back.

[0037] Specifically, the roller assembly 300 also includes a linear cylinder 309, a first rotating arm 310, a second rotating arm 311, a roller brush mounting bracket 312, and a roller brush motor 313. The linear cylinder 309 is disposed on the front end wall of the third sliding plate 304. The rear end of the first rotating arm 310 is rotatably connected to the sliding block 3091 of the linear cylinder 309. The front end of the first rotating arm 310 is rotatably connected to the rear end of the second rotating arm 311. The middle of the second rotating arm 311 is rotatably connected to the lower end wall of the middle of the third sliding plate 304. The upper end of the roller brush mounting bracket 312 is fixedly connected to the front end of the second rotating arm 311. The roller brush motor 313 is disposed at the lower end of the roller brush mounting bracket 312. One end of the roller brush 303 is fixedly connected to the output shaft of the roller brush motor 313.

[0038] Specifically, the roller assembly 300 also includes a first motor 314, a driving synchronous pulley 315, a driven synchronous pulley 316, a synchronous belt 317, a second slide rail 318, and a second slider 319. The second motor 314 is disposed at one end of the side plate 301, the driving synchronous pulley 315 is disposed on the output shaft of the first motor 314, the driven synchronous pulley 316 is rotatably disposed at the other end of the side plate 301, the synchronous belt 317 is meshed with the driving synchronous pulley 315 and the driven synchronous pulley 316 respectively, the second slide rail 318 is disposed on the front end wall of the side plate 301, the second slider 319 is slidably connected to the second slide rail 318, the lower end of the second sliding plate 302 is fixedly connected to the second slider 319, and the upper end of the second sliding plate 302 is fixedly connected to the synchronous belt 317.

[0039] Specifically, it also includes a third slide rail (not shown), a third slider 101, a fourth slider 102, and a crossbeam 103. The third slide rail is respectively disposed on both sides of the upper end of the frame 100. The third slider 101 and the fourth slider 102 are slidably connected to the third slide rail. The two ends of the first sliding plate 201 are respectively fixedly connected to the third slider 101. The two ends of the crossbeam 103 are respectively fixedly connected to the fourth slider 102. The rear end walls of the two ends of the first sliding plate 201 are respectively detachably fixedly connected to the crossbeam 103.

[0040] Specifically, it also includes a second motor 104, a lead screw 105, and a nut 106. The second motor 104 is located at one end of the upper end of the frame 100. The two ends of the lead screw 105 are rotatably connected to the upper end of the frame 100. The output shaft of the second motor 104 is fixedly connected to one end of the lead screw 105. The nut 106 is located at one end of the crossbeam 103 and is threadedly connected to the lead screw 105.

[0041] Specifically, it also includes a first electromagnet 107 and a second electromagnet 108. The first electromagnet 107 and the second electromagnet 108 are respectively disposed on the front end wall and the rear end wall at both ends of the first sliding plate 201. An iron plate 1031 is respectively disposed on the front end wall at both ends of the crossbeam 103. The first electromagnet 107 is detachably and fixedly connected to the upper end of the frame 100, and the second electromagnet 108 is detachably and fixedly connected to the iron plate 1031.

[0042] Specifically, the working principle and process of this invention are as follows: The stencil is cleaned by transferring solder paste. First, a lifting cylinder raises the scraper to contact the stencil. Then, a motor drives the scraper to reciprocate, scraping off excess solder paste from the stencil. Simultaneously, vacuum suction transfers the solder paste onto the scraper, effectively cleaning the solder paste on the stencil. Next, a rotating roller brush cleans and transfers the solder paste on the scraper. Finally, the roller brush is rotated to contact the stencil, and the brush cleans and transfers the solder paste on it. The scraped-off solder paste waste is collected and recycled through a material box, thus achieving a paperless stencil cleaning process. There is no need to stop the machine to change the cleaning paper, improving production efficiency and saving cleaning paper to reduce production costs.

[0043] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A paperless stencil cleaning device for a fully automatic solder paste printing machine, characterized in that, The system includes a frame, a cleaning assembly, a roller assembly, and a brush assembly. A steel mesh is provided at the upper end of the frame. The cleaning assembly includes a first sliding plate, a lifting plate, and scrapers. The two ends of the first sliding plate are slidably connected to the two sides of the upper end of the frame, respectively. The front end walls of the two ends of the first sliding plate are detachably fixedly connected to the front end walls of the two sides of the frame, respectively. The lifting plate is slidably connected to the first sliding plate, and the scrapers are arranged parallel to each other at the upper end of the lifting plate, with the upper end walls of each scraper slidably abutting against the lower end wall of the steel mesh. The roller assembly... The component includes a side plate, a second sliding plate, and a roller brush. The side plate is disposed on the upper end of the front wall of the frame. The second sliding plate is slidably connected to the side plate from left to right. The roller brush is rotatably disposed on the lower end of the second sliding plate and is rotatably connected to the second sliding plate from front to back. The roller brush can abut against the upper end wall of the scraper. The brush assembly includes a material box and a brush. The material box is disposed on one side of the upper end wall of the front end of the frame. The brush is vertically disposed in the material box and can abut against the roller brush.

2. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 1, characterized in that, The cleaning assembly further includes a lifting cylinder, a vacuum tube, and a scraper mounting base. The lifting cylinder is respectively disposed at both ends of the upper wall of the first sliding plate, and the cylinder rod of the lifting cylinder is fixedly connected to both ends of the lifting plate. The vacuum tube is disposed on the lower wall of the lifting plate, one end of the vacuum tube is closed, and the other end of the vacuum tube is provided with a vacuum pump air pipe interface. The scraper mounting base is disposed on the upper wall of the lifting plate, and the upper wall of the scraper mounting base is provided with multiple slots spaced parallel to each other. The scraper is detachably embedded in the slots. The upper wall of the vacuum tube is provided with multiple first opening slots. The upper wall of the lifting plate is provided with multiple first through slots communicating with the first opening slots in the middle. The upper wall of the scraper mounting base is provided with multiple second through slots communicating with the first through slots.

3. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 2, characterized in that, The cleaning assembly also includes a pressure plate and fastening bolts. The rear end of the pressure plate has two oblong holes arranged side by side. The two ends of the scraper mounting base have threaded holes that correspond one-to-one with the oblong holes. The fastening bolts are respectively inserted into the oblong holes and screwed into the threaded holes. The front end wall of the pressure plate has a first limiting groove. The two ends of the scraper are respectively embedded in the first limiting groove, and the inner top wall of the first limiting groove abuts against the upper end wall of the scraper.

4. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 2, characterized in that, The upper wall of the lifting plate is provided with multiple limiting blocks along the length direction, and the lower wall of the scraper mounting base is provided with multiple second limiting grooves corresponding to the limiting blocks one by one. The limiting blocks are detachably embedded in the second limiting grooves.

5. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 1, characterized in that, The roller assembly further includes a third sliding plate, a first slide rail, a first slider, a spring, and a limiting post. The first slide rail is vertically disposed at both ends of the front end wall of the second sliding plate. The first slider is slidably connected to the first slide rail. Both ends of the third sliding plate are fixedly connected to the first slider. A limiting plate protrudes from the middle front end wall of the second sliding plate. A through hole is provided at both ends of the limiting plate. The limiting post is slidably connected to the through hole. The lower end of the limiting post is fixedly connected to the lower end of the third sliding plate. A limiting flange is provided at the upper end of the limiting post. The limiting flange can abut against the upper end wall of the through hole. The spring is sleeved on the limiting post, and the upper and lower ends of the spring abut against the lower end wall of the through hole and the third sliding plate, respectively. The roller brush is rotatably connected to the lower end of the third sliding plate.

6. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 5, characterized in that, The roller assembly further includes a linear cylinder, a first rotating arm, a second rotating arm, a roller brush mounting bracket, and a roller brush motor. The linear cylinder is disposed on the front end wall of the third sliding plate. The rear end of the first rotating arm is rotatably connected to the sliding block of the linear cylinder. The front end of the first rotating arm is rotatably connected to the rear end of the second rotating arm. The middle of the second rotating arm is rotatably connected to the lower end wall of the middle of the third sliding plate. The upper end of the roller brush mounting bracket is fixedly connected to the front end of the second rotating arm. The roller brush motor is disposed at the lower end of the roller brush mounting bracket. One end of the roller brush is fixedly connected to the output shaft of the roller brush motor.

7. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 1, characterized in that, The roller assembly further includes a first motor, a driving synchronous pulley, a driven synchronous pulley, a synchronous belt, a second slide rail, and a second slider. The second motor is disposed at one end of the side plate, the driving synchronous pulley is disposed on the output shaft of the first motor, and the driven synchronous pulley is rotatably disposed at the other end of the side plate. The synchronous belt is meshed with the driving synchronous pulley and the driven synchronous pulley respectively. The second slide rail is disposed on the front end wall of the side plate, the second slider is slidably connected to the second slide rail, the lower end of the second sliding plate is fixedly connected to the second slider, and the upper end of the second sliding plate is fixedly connected to the synchronous belt.

8. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 1, characterized in that, It also includes a third slide rail, a third slider, a fourth slider, and a crossbeam. The third slide rail is respectively disposed on both sides of the upper end of the frame. The third slider and the fourth slider are slidably connected to the third slide rail. The two ends of the first sliding plate are respectively fixedly connected to the third slider. The two ends of the crossbeam are respectively fixedly connected to the fourth slider. The rear end walls of the two ends of the first sliding plate are respectively detachably fixedly connected to the crossbeam.

9. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 8, characterized in that, It also includes a second motor, a lead screw, and a nut. The second motor is located at one end of the upper end of the frame. The two ends of the lead screw are rotatably connected to the upper end of the frame. The output shaft of the second motor is fixedly connected to one end of the lead screw. The nut is located at one end of the crossbeam and is threadedly connected to the lead screw.

10. The paperless stencil cleaning device for a fully automatic solder paste printing machine according to claim 8, characterized in that, It also includes a first electromagnet and a second electromagnet, which are respectively disposed on the front end wall and the rear end wall of the first sliding plate. An iron plate is provided on the front end wall of the two ends of the crossbeam. The first electromagnet is detachably and fixedly connected to the upper end of the frame, and the second electromagnet is detachably and fixedly connected to the iron plate.

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